fix: clippy errors (#3772)

* fix: use map instead of if else

* fix: needless lifetime

reactive_stores/src/len.rs

@@ -63,7 +63,7 @@ delegate_impl_len!(<T,> Vec<T>);
 delegate_impl_len!(str);
 delegate_impl_len!(String);
 
-impl<'a> Len for Cow<'a, str> {
+impl Len for Cow<'_, str> {
     #[inline(always)]
     fn len(&self) -> usize {
         <str>::len(self)
@@ -75,7 +75,7 @@ impl<'a> Len for Cow<'a, str> {
     }
 }
 
-impl<'a> Len for &Cow<'a, str> {
+impl Len for &Cow<'_, str> {
     #[inline(always)]
     fn len(&self) -> usize {
         Len::len(*self)
@@ -87,7 +87,7 @@ impl<'a> Len for &Cow<'a, str> {
     }
 }
 
-impl<'a> Len for &mut Cow<'a, str> {
+impl Len for &mut Cow<'_, str> {
     #[inline(always)]
     fn len(&self) -> usize {
         Len::len(*self)
@@ -99,7 +99,7 @@ impl<'a> Len for &mut Cow<'a, str> {
     }
 }
 
-impl<'a, T> Len for Cow<'a, [T]>
+impl<T> Len for Cow<'_, [T]>
 where
     [T]: ToOwned,
 {
@@ -114,7 +114,7 @@ where
     }
 }
 
-impl<'a, T> Len for &Cow<'a, [T]>
+impl<T> Len for &Cow<'_, [T]>
 where
     [T]: ToOwned,
 {
@@ -129,7 +129,7 @@ where
     }
 }
 
-impl<'a, T> Len for &mut Cow<'a, [T]>
+impl<T> Len for &mut Cow<'_, [T]>
 where
     [T]: ToOwned,
 {

server_fn_macro/src/lib.rs

@@ -648,16 +648,11 @@ impl ServerFnCall {
 
     /// Return the name and type of the first field if there is only one field.
     fn single_field(&self) -> Option<(&Pat, &Type)> {
-        if let Some(field) = self
-            .body
+        self.body
             .inputs
             .first()
             .filter(|_| self.body.inputs.len() == 1)
-        {
-            Some((&field.arg.pat, &field.arg.ty))
-        } else {
-            None
-        }
+            .map(|field| (&*field.arg.pat, &*field.arg.ty))
     }
 
     fn deref_impl(&self) -> TokenStream2 {